⚙️ Technological Process

Pelletizing Process

Pelleting is a mechanical process of compressing ground raw materials into solid cylindrical granules — pellets. Used for biomass, animal feed and fertilisers.

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50–12.000 kg/h Line capacity
6–12 mm Pellet Diameter
90–98% Raw material utilisation
3–5 god Average return on investment

What is pelleting and how does it work?

Pelleting is a process in which pre-ground and dried raw material is fed into the pellet mill chamber, where a roller mechanically forces it through the die holes. Under the pressure and heat generated by friction, lignin in the raw material is activated and acts as a natural binder — the pellet gains hardness without any additives.

The finished pellets are cut by knives to the desired length, then pass through a cooler which hardens them and reduces moisture to ≤10%. The finished product has high energy density and is easy to transport and store.

1

Raw material preparation

Drying to ≤15% moisture, crushing to a fraction ≤6 mm

2

Compression in pellet mill

The roller presses the raw material through the die under 100–250 bar pressure

3

Cooling i stvrdnjavanje

Cooler reduces pellet temperature and moisture to ≤10%

4

Sieving and packaging

Vibro sieve separates fines; pellets are packed in bags or in bulk

🔑 Key advantages of pelleting

  • Increase in raw material energy density up to 5×
  • Easier transport and storage — dust-free
  • Consistent quality and measurable calorific value
  • No chemical additives — lignin as natural binder
  • High degree of automation, low labour requirement
  • Pellets comply with ENplus A1/A2 standards
  • Fast return on investment — high market value of pellets
Die pressure
100–250 bar
Temp. matrice
80–120 °C
Moisture input
≤ 15 %
Moisture output
≤ 10 %

When is the pelleting process used?

Pelleting is applied in a large number of industries — wherever loose or wet material needs to be transformed into uniform granules.

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Biomass for heating
Sawdust, wood chips, straw, corn stalks and wood-processing residues are pelleted into energy pellets for boilers.
Sawdust Straw Wood chips Forest biomass
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Animal feed
Mixtures of grain, proteins and vitamins are pelleted for feeding cattle, pigs, poultry and fish.
Corn Soy Whey Premixes
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Organic fertilisers
Animal manure, compost and bio-waste are pelleted into granular fertilisers for easier application.
Manure Compost Bio-waste

Pelleting machines

AM Tehnolog offers a complete range of pellet mills for every capacity and raw material typene.

Technology Lines with pelleting

View complete lines in which the pellet mill is the central part of the process.

Key Pelletizing Process Parameters

Factors that determine pellet quality and pelletizing efficiency.

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Raw Material Moisture
10–15 %
Optimal moisture for biomass. Too high causes blockages, too low — dust and shorter die life.
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Particle Size
≤ 6 mm
Homogeneous fraction ensures uniform die filling and high pellet mechanical durability.
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Die temperature
80–120 °C
Toplota nastaje trenjem. Aktivira lignin koji deluje kao prirodno vezivo bez aditiva.
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Specific Energy Consumption
45–90 kWh/t
Depends on raw material type, moisture and pellet diameter. Biomass is more efficient than animal feed.
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Pellet Diameter
6–12 mm
6 mm for biomass fuel, 8–10 mm for animal feed. Length 15–30 mm depending on raw material.
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Mechanical Durability
> 97,5 %
ENplus A1 standard requires DU ≥ 97.5%. AM Tehnolog pellet mills routinely achieve 98–99%.

Ready to start a pelleting line?

Contact us for a free technical consultation and a custom quote for your raw material and capacity.